* {
  margin: 0;
  padding: 0;
}

.container {
  width: 600px;
  height: 550px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: 2px solid #ccc;
  border-radius: 5px;
  padding: 10px;
  box-sizing: border-box;
}